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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138d8c89aa06f71374894af30c8c51d2100b59ef66b1a6931694138acd7a4aca' 
  AND token = '3q91CsoVx7x1q8zWKcfu1zI4Y7uZc3v0m8v+n1bdEFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}